Fixes security vunerability

https://snyk.io/test/npm/ngx-diff2html/0.0.4

Author: hhiranandani

package.json

@@ -24,7 +24,7 @@
     "@angular/platform-browser-dynamic": "~8.2.14",
     "@angular/router": "~8.2.14",
     "diff-match-patch": "^1.0.4",
-    "diff2html": "^2.12.2",
+    "diff2html": "^3.0.0",
     "ng-zorro-antd": "^8.5.2",
     "path": "^0.12.7",
     "rxjs": "~6.4.0",